QFN/BTC Side Termination - Fillets and Wettability

Since side fillets are not a requirement for QFNs/BTCs due to some packages not having wettable side terminations, how does one determine if the side terminations are actually solderable/designed for wetting?

Is it simply if the side terminations are plated in the same way the bottom terminations are, then fillets are likely/preferred?

If not plated and only exposed copper from packaging process, does that indicate no side fillets?

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